Radiology & Diagnostic Imaging Revenue Cycle Audit
Hospital imaging departments, freestanding outpatient imaging centers, and radiologist groups lose 14% to 26% of gross allowed charges to unbilled CAD add-ons, Modifier 26/TC split mismatches, and pre-auth denials.
Diagnostic and interventional radiology operations face complex revenue cycle challenges governed by tight technical (TC) versus professional (26) component splits, strict ordering physician documentation rules, and automated clinical decision support mechanism (CDSM) mandates. Imaging centers frequently suffer denials when contrast studies (with and without contrast) are improperly unbundled, or when computerized tomographic angiography (CTA) is billed without documented vascular reformations. Our forensic radiology billing audit reconciles PACS modality worklists with RIS/billing software to capture 100% of performed scans.
Audit red flags
- Reconciliation gap: Modality PACS server shows completed studies that were never converted to billable claims in billing software.
- Payers denying Modifier 26 professional interpretation claims because ordering provider NPI was missing or inactive in PECOS.
- Automated downcoding of Complete Abdominal Ultrasound (CPT 76700) to Limited (76705) due to omitted gallbladder or pancreas views.
- Clearinghouses rejecting batch 837P files due to missing Mammography Quality Standards Act (MQSA) facility certification numbers.
Audit action plan
- 1. Modality Worklist PACS-to-Billing Reconciliation — Deploy automated reconciliation scripts comparing DICOM study UID counts from CT/MRI scanners against adjudicated claim batches to eliminate ghost studies.
- 2. Clinical Decision Support Mechanism (CDSM) Audit — Verify that qualifying AUC consultation codes (HCPCS G-codes and modifier ME/MF) are populated on all advanced diagnostic outpatient orders.
- 3. Technical vs Professional Component Split Automation — Configure clearinghouse rules to automatically append Modifier 26 or TC based on facility place of service (POS 11 vs POS 22/24).
Codes reviewed
- 72148 / 72158 — MRI Lumbar Spine Without / With & Without Contrast
- 71260 / 71270 — CT Thorax With Contrast / With & Without Contrast
- 77067 / 77063 — Screening Mammography Bilateral + 3D Tomosynthesis Add-on
- 76700 / 76705 — Ultrasound Abdominal Complete vs Limited
Frequently asked questions
What is required to bill a Complete Abdominal Ultrasound (CPT 76700)?
CMS and AMA guidelines require documentation and permanent image archiving of all eight anatomical structures: liver, gallbladder, common bile duct, pancreas, spleen, kidneys, abdominal aorta, and inferior vena cava. If any structure is not visualized and no explanation is provided, the exam must be downcoded to CPT 76705.
How do you overturn radiologist Modifier 26 denials when the hospital bills global?
When a hospital mistakenly bills a global charge for POS 22 instead of technical component only (Modifier TC), our audit team files an administrative grievance citing the facility NPI and demanding the payer retract the incorrect hospital payment to remit the physician interpretation fee.